The chrony has that file.
... for ntp feature, the folder /var/lib/ntp/ is empty even the ntpd is working.
I will use chronyd, but is this a real problem with ntp feature?

It looks to me as if that 'driftfile' reference is just defining the
location of the file that holds the offset and drift rate.  It isn't a
command, it's a 'directive' for chrony.conf.